Question

Someone please help, I'm stuck!

From the table below, determine whether the data shows an exponential function. Explain why or why not.

x: 3, 1, -1, -3
y: 1, 2, 3, 4

(A) No; the domain values are at regular intervals and the range values have a common sum 1.
(B) No; the domain values are not at regular intervals.
(C) Yes; the domain values are at regular intervals and the range values have a common factor 2.
(D) Yes; the domain values are at regular intervals and the range values have a common sum 1.

Answer 1

If you plot all the points, you'll see that they lie on the same straight line. Therefore the function is not exponential. 

In terms of the context of your answer choices, the final answer is choice A. The domain values are at regular intervals (in this case 2) while the range values increment by the same value as well (1 in this case).